Water‐soluble polymer and photocatalysis for arsenic removal

Abstract

In this study, the photocatalytic oxidation of hazardous arsenite (As(III)) to arsenate (As(V)) and the sequential removal of arsenate from aqueous solution by liquid-phase polymer-based retention (LPR) were investigated. The photocatalytic oxidation of arsenite was performed using TiO 2 (P25 Degussa, Germany) under UV-A light. The optimal photocatalytic conditions to oxidize 10 mg L 21 of arsenite solution were achieved using a 0.5 g L 21 of catalyst at a pH value of 2. The As(III) oxidation reached 100% after 30 min of illumination with UV-A light. A water-soluble polymer containing quaternary ammonium groups, poly(3-acrylamidopropyl)trimethylammonium chloride (P(ClAPTA)), was used as an extracting reagent in the LPR process. To obtain the optimized conditions, the removal experiments were performed at various polymer : As(V) molar ratios using 10 mg L 21 of arsenate solutions. After the oxidation of As(III) to As(V), the removal of arsenate by P(ClAPTA) was obtained in a 99% yield using a 20 : 1 polymer : As(V) molar ratio at a pH value of 9. The results demonstrate that the combination of these methods is highly useful for potential applications related to the treatment of wastewater contaminated with As(III).

Water-Soluble and Insoluble Polymers, Nanoparticles, Nanocomposites and Hybrids With Ability to Remove Hazardous Inorganic Pollutants in Water

“…The removal of arsenic by water-soluble polymer was obtained in a 99% yield using a 20:1 polymer:As(V) molar ratio at a pH value of 9. The results demonstrate that the combination of these methods is highly useful for potential applications related to the treatment of wastewater contaminated with As(III) (Yuksel et al, 2014 ).…”

“…Those methods include the use of LPR as a pre or post treatment in combined methods such as chemical or electrochemical oxidation/reduction coupled to ultrafiltration using water-soluble polymers (Arar et al, 2014 ; Sánchez et al, 2015 , 2017 ; Chou et al, 2018 ). In addition, photocatalysis has been used in combination to LPR to remove improve removal capacities of arsenic (Yuksel et al, 2014 ; Molinari and Argurio, 2017 ).…”

“…On the other hand, photocatalysis and LPR have been combined to oxidize As(III) to As(V), and then removed by LPR (Yuksel et al, 2014 ; Molinari and Argurio, 2017 ). The photocatalytic oxidation of As(III) was performed using TiO 2 under UV-A light.…”

EFFICIENT REMOVAL OF Cr(VI) BY POLYELECTROLYTE-ASSISTED ULTRAFILTRATION AND SUBSEQUENT ELECTROCHEMICAL REDUCTION TO Cr(III)

“…16 Recently, PEUF has been used in combination with photocatalysis processes, 17 and electro-oxidation to remove arsenic species. 18,19 The advantage of the latter was the double use of a polyelectrolyte as a supporting electrolyte in the electro-oxidation and for extracting materialassisted ultrafiltration.…”

Ultrafiltration assisted by water-soluble poly(diallyl dimethyl ammonium chloride) for As(V) removal

“…The unbound arsenic species, with diameters that are less than that of the membrane cutoff diameter, pass through the membrane along with the permeate [10,11]. The LPR technique involves the use of a (UF) membrane that separates the ionic species that interacts with the functional groups of water-soluble polymers with high molecular weights, thus preventing them from passing through the membrane [12][13][14][15][16][17].…”